dan springer is live in seattle. dan. >> reporter: yeah, jon the grounding is a major blow to boeing and the airlines that have sung billions of dollars into this plane of the future. airlines around the world are scrambling to bring in jets to replace the 787s that are not allowed to fly right now. that's led to flight delays and cancellations. many passengers have been stranded, their plans in limbo. for the most part they've been saying, better safe than sorry. >> i'd rather have to fly either tomorrow or sake som take some flights tonight by different airplane lines than put in the risk of anything happening, you know. >> reporter: the faa's directive followed an emergency landing of a 787 in japan yesterday. a lithium eye on battery below the cockpit overheated and hot chemicals sprayed out of it. a different battery i cracked open the other day. they have to prove the dream lean iris safe before it can fly again. the battery manufacturer told reporters it could take months just to figure out what the problem is